In Kenya, extra county schools fall in the second tier after national schools. In recent years, cases have emerged where extra county schools perform better than national school. Nyambaria Boys and Sironga Girls Girls are the national schools in Nyamira county.
Extra county secondary schools in Nyamira county are grouped into three clusters; cluster one(C1), cluster two(C2) and cluster three (C3).
Nyamira Boys High School, St. Peter’s Nyakemincha Secondary School, Gesiaga Secondary School among other schools form cluster one schools in Nyamira county.
Here is a list of best performing Extra County schools in Nyamira County
| S/N | SCHOOL CODE | SCHOOL NAME | TYPE | CLUSTER |
| 1. | 43706109 | Nyamira Boys High School | Boys | C1 |
| 2. | 43706110 | Gesiaga Secondary School | Mixed | C1 |
| 3. | 43706115 | Kebirigo High School | Boys | C1 |
| 4. | 43706117 | St. Peter’s Nyakemincha Secondary School | Mixed | C1 |
| 5. | 43720107 | Menyenya S.D.A High School | Mixed | C1 |
| 6. | 43720113 | St. Paul’s Nyandoche Secondary School | Girls | C1 |
| 7. | 43722101 | St Paul’s Gekano Boys High School | Boys | C1 |
| 8. | 43722107 | Nyaikuro High School | Mixed | C1 |
| 9. | 43706101 | Nyansabakwa Secondary School | Boys | C2 |
| 10. | 43706107 | Marindi Secondary School | Mixed | C2 |
| 11. | 43715105 | St. Cyprian Biticha Secondary School | Mixed | C2 |
| 12. | 43720106 | Nyansiongo High School | Boys | C2 |
| 13. | 43720111 | Mwongori Secondary School | Mixed | C2 |
| 14. | 43722104 | Tombe Girls High School | Girls | C2 |
| 15. | 43728105 | Kebabe Girls Secondary School | Girls | C2 |
| 16. | 43728120 | Nyamiranga Secondary School | Mixed | C2 |
| 17. | 43706102 | Our Lady Of Mercy Rangenyo Girls Secondary School | Girls | C3 |
| 18. | 43715112 | Nyakongo High School | Boys | C3 |
| 19. | 43720110 | St Mathias Mulumba Secondary School | Girls | C3 |
| 20. | 43728210 | Matongo Boys High School | Boys | C3 |